Bitcoin and Nostr software
Safer signing and dependable infrastructure for open protocols
Threenine builds product suites for Nostr identity safety, private-key protection, relays, storage, backend services, and practical Bitcoin and Nostr workflows.
Open protocols only help when people can use and operate them without giving control away again.
Nostr and Bitcoin create different defaults for identity, publishing, payments, and infrastructure. Threenine focuses on the product work that makes those defaults practical: safer signing, clearer trust boundaries, and backend systems that operators can understand.
Product focus
- Nostr identity and signing workflows that keep private keys closer to the user.
- Approval flows that make signing requests understandable before an event is produced.
- Nostr relay, storage, and backend-service infrastructure for builders and operators.
- Specialist engineering support for teams building aligned Bitcoin and Nostr products.
Diogel
Sign Nostr events without handing websites your private key.
Diogel is the signing and key-protection suite. Its current public product is a free, open-source NIP-07 browser extension that keeps keys encrypted locally, makes approval flows readable, and gives people a cleaner way to use Nostr across multiple identities.
Encrypted local vault
Keys stay inside an encrypted password-protected vault with auto-lock support.
Multiple identities
Keep personal, work, and anonymous Nostr accounts separate without juggling separate tools.
Granular approvals
Review each request and control permissions by site and request type instead of blindly signing.
Relay control
Configure the relays you want to use so your setup matches your actual workflow.
Diogel
Free, open-source NIP-07 signer browser extension
Relay and backend foundations for Nostr builders.
Nostrfi is the infrastructure pillar for relays, storage, backend services, and operator workflows. The public positioning is intentionally careful: foundations first, with hosted-service promises only when the product and operating model are ready.
Explore NostrfiRelay operations
Event storage, subscriptions, retention choices, policy, and moderation need clear operating boundaries.
Backend services
Nostr products need protocol-aware backend systems that can be monitored, documented, and maintained.
Observability
Operational visibility turns infrastructure from a hidden liability into a manageable product surface.
Operator clarity
Deployment choices, protocol assumptions, and reliability limits should be explicit before scaling.
Practical product pillars for Bitcoin and Nostr.
Diogel and Nostrfi give the company strategy a clear shape: safer signing on one side, dependable infrastructure on the other.
How to Choose Nostr Relays
Learn how to choose Nostr relays without guesswork. This guide covers privacy, reliability, search support, relay quality, and what to avoid.
Nostr Relays, Privacy, and Security
Understand the privacy and security trade-offs of Nostr relays, including what relay operators can observe, what they cannot do, and how to use relays more safely.
What is a Nostr Relay?
Learn what a Nostr relay is, how relays work, and why they matter for privacy, censorship resistance, availability, and everyday use on Nostr.
Why Nostr keys and identity are better for privacy
Nostr replaces account recovery, phone-number signups, and centrally managed identities with cryptographic keys. That changes privacy, but it also shifts responsibility onto the user.
Best Nostr Browser Extensions (2026): Complete Comparison
Compare the best Nostr browser extensions of 2026. We review Diogel, Alby, Nos2x, and Nsec.app to help you choose the right NIP-07 signer for secure key management.
Product design & development
Threenine provides focused product design and development services for Nostr and Bitcoin protocol-based products and privacy-sensitive software.
Nostr Product Engineering
Focused engineering support for teams building signers, browser extensions, relays, backend services, and protocol-aware product experiences.
Bitcoin Product Engineering
Bitcoin-native and Bitcoin-aligned product work shaped around payments, ownership, privacy, and user control.
Our Mission
We build owned products first, then support aligned teams where protocol constraints, trust boundaries, keys, relays, payments, and user control genuinely matter.